<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
       
       function computed(str) {


            var newstr2 = ''
            for (var i = 0; i < str.length; i++) {
             if (str[i] == ' ') {
            
         } else {

             if (str[i] == '!') {
              newstr2 += '啊'
         } else if (str[i] == 'h') {
             newstr2 += 'H'
            } else if (str[i] == 'w') {
             newstr2 += 'W'
        } else {
            newstr2 += str[i]
             }
           }
            
         }
             let newstr1 = newstr2.split("").reverse().join('')
             return newstr1
            }
            console.log(computed(' hello world 我爱你!'));
    </script>
</body>
</html>